CoRegisterClassObject

// OLE32.dll
#include <windows.h>

HRESULT CoRegisterClassObject(
    const GUID* rclsid,
    IUnknown* pUnk,
    CLSCTX dwClsContext,
    DWORD flags,
    DWORD* lpdwRegister
);

<DllImport("OLE32.dll", ExactSpelling:=True)>
Public Shared Function CoRegisterClassObject(
    ByRef rclsid As Guid,   ' GUID*
    pUnk As IntPtr,   ' IUnknown*
    dwClsContext As UInteger,   ' CLSCTX
    flags As UInteger,   ' DWORD
    <Out> ByRef lpdwRegister As UInteger   ' DWORD* out
) As Integer
End Function

' rclsid : GUID*
' pUnk : IUnknown*
' dwClsContext : CLSCTX
' flags : DWORD
' lpdwRegister : DWORD* out
Declare PtrSafe Function CoRegisterClassObject Lib "ole32" ( _
    ByVal rclsid As LongPtr, _
    ByVal pUnk As LongPtr, _
    ByVal dwClsContext As Long, _
    ByVal flags As Long, _
    ByRef lpdwRegister As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

CoRegisterClassObject = ctypes.windll.ole32.CoRegisterClassObject
CoRegisterClassObject.restype = ctypes.c_int
CoRegisterClassObject.argtypes = [
    ctypes.c_void_p,  # rclsid : GUID*
    ctypes.c_void_p,  # pUnk : IUnknown*
    wintypes.DWORD,  # dwClsContext : CLSCTX
    wintypes.DWORD,  # flags : DWORD
    ctypes.POINTER(wintypes.DWORD),  # lpdwRegister : DWORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLE32.dll')
CoRegisterClassObject = Fiddle::Function.new(
  lib['CoRegisterClassObject'],
  [
    Fiddle::TYPE_VOIDP,  # rclsid : GUID*
    Fiddle::TYPE_VOIDP,  # pUnk : IUnknown*
    -Fiddle::TYPE_INT,  # dwClsContext : CLSCTX
    -Fiddle::TYPE_INT,  # flags : DWORD
    Fiddle::TYPE_VOIDP,  # lpdwRegister : DWORD* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "ole32")]
extern "system" {
    fn CoRegisterClassObject(
        rclsid: *const GUID,  // GUID*
        pUnk: *mut core::ffi::c_void,  // IUnknown*
        dwClsContext: u32,  // CLSCTX
        flags: u32,  // DWORD
        lpdwRegister: *mut u32  // DWORD* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLE32.dll")]
public static extern int CoRegisterClassObject(ref Guid rclsid, IntPtr pUnk, uint dwClsContext, uint flags, out uint lpdwRegister);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLE32_CoRegisterClassObject' -Namespace Win32 -PassThru
# $api::CoRegisterClassObject(rclsid, pUnk, dwClsContext, flags, lpdwRegister)

#uselib "OLE32.dll"
#func global CoRegisterClassObject "CoRegisterClassObject" sptr, sptr, sptr, sptr, sptr
; CoRegisterClassObject varptr(rclsid), pUnk, dwClsContext, flags, varptr(lpdwRegister)   ; 戻り値は stat
; rclsid : GUID* -> "sptr"
; pUnk : IUnknown* -> "sptr"
; dwClsContext : CLSCTX -> "sptr"
; flags : DWORD -> "sptr"
; lpdwRegister : DWORD* out -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

#uselib "OLE32.dll"
#cfunc global CoRegisterClassObject "CoRegisterClassObject" var, sptr, int, int, var
; res = CoRegisterClassObject(rclsid, pUnk, dwClsContext, flags, lpdwRegister)
; rclsid : GUID* -> "var"
; pUnk : IUnknown* -> "sptr"
; dwClsContext : CLSCTX -> "int"
; flags : DWORD -> "int"
; lpdwRegister : DWORD* out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; HRESULT CoRegisterClassObject(GUID* rclsid, IUnknown* pUnk, CLSCTX dwClsContext, DWORD flags, DWORD* lpdwRegister)
#uselib "OLE32.dll"
#cfunc global CoRegisterClassObject "CoRegisterClassObject" var, intptr, int, int, var
; res = CoRegisterClassObject(rclsid, pUnk, dwClsContext, flags, lpdwRegister)
; rclsid : GUID* -> "var"
; pUnk : IUnknown* -> "intptr"
; dwClsContext : CLSCTX -> "int"
; flags : DWORD -> "int"
; lpdwRegister : DWORD* out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	ole32 = windows.NewLazySystemDLL("OLE32.dll")
	procCoRegisterClassObject = ole32.NewProc("CoRegisterClassObject")
)

// rclsid (GUID*), pUnk (IUnknown*), dwClsContext (CLSCTX), flags (DWORD), lpdwRegister (DWORD* out)
r1, _, err := procCoRegisterClassObject.Call(
	uintptr(rclsid),
	uintptr(pUnk),
	uintptr(dwClsContext),
	uintptr(flags),
	uintptr(lpdwRegister),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function CoRegisterClassObject(
  rclsid: PGUID;   // GUID*
  pUnk: Pointer;   // IUnknown*
  dwClsContext: DWORD;   // CLSCTX
  flags: DWORD;   // DWORD
  lpdwRegister: Pointer   // DWORD* out
): Integer; stdcall;
  external 'OLE32.dll' name 'CoRegisterClassObject';

result := DllCall("OLE32\CoRegisterClassObject"
    , "Ptr", rclsid   ; GUID*
    , "Ptr", pUnk   ; IUnknown*
    , "UInt", dwClsContext   ; CLSCTX
    , "UInt", flags   ; DWORD
    , "Ptr", lpdwRegister   ; DWORD* out
    , "Int")   ; return: HRESULT

●CoRegisterClassObject(rclsid, pUnk, dwClsContext, flags, lpdwRegister) = DLL("OLE32.dll", "int CoRegisterClassObject(void*, void*, dword, dword, void*)")
# 呼び出し: CoRegisterClassObject(rclsid, pUnk, dwClsContext, flags, lpdwRegister)
# rclsid : GUID* -> "void*"
# pUnk : IUnknown* -> "void*"
# dwClsContext : CLSCTX -> "dword"
# flags : DWORD -> "dword"
# lpdwRegister : DWORD* out -> "void*"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。